import numpy as np
import time

# -----

def combine_planes(img):
    tmp_img = img.astype('int32')
    b,g,r = tmp_img[:,:,0], tmp_img[:,:,1], tmp_img[:,:,2]
    combo = b + g * (2**8) + r * (2**16)
    return combo

# -----

test_image = (np.random.rand(1080,1920,3) * 255).astype('uint8')

deltas = [0.0, 0.0, 0.0, 0.0]

ITER_COUNT = 5

for i in range(ITER_COUNT):
    t1 = time.time()
    im=test_image.reshape(1,-1,3)
    t2 = time.time()
    im = combine_planes(im)
    t3 = time.time()
    im_list=im.tolist()
    t4 = time.time()
    im_set=set(im_list[0])
    t5 = time.time()
    deltas[0] += t2 - t1
    deltas[1] += t3 - t2
    deltas[2] += t4 - t3
    deltas[3] += t5 - t4

deltas[:] = [n / ITER_COUNT for n in deltas]

print deltas